Scanner Code

scan.rb

#application.rb  
# Avoid, the scanner gets auto started when device starts up.
# Avoid, the scanner gets auto started when application start. 
def on_activate_app
    begin
      Scanner.stop
    rescue
    end
end
#app/layout.erb
<meta http-equiv="PowerOn" content="PowerOnEvent:url('/app/TransferDetail/stop_scanner')">

# In controller's we use
def activate_scanner
    Scanner.enabled = "SCN2"
    # Only a sample code, the actual callback event method is controller and context specific.
    Scanner.decodeEvent = "/app/TransferDetail/take_barcode_callback?hardware_scan=false"
end


# This will be called after we call activate_scanner method
# The method set_scanner_status will toggle "start" and "stop". This is used by "soft button".
def set_scanner_status
    if Rho::RhoConfig.SCANNER_STATUS == "0" || Rho::RhoConfig.SCANNER_STATUS == ""
      Scanner.start
      WebView.execute_js("toggleScannerUI(1)")
      Rho::RhoConfig.SCANNER_STATUS = "1"
    else
      Scanner.stop
      WebView.execute_js("toggleScannerUI(0)")
      Rho::RhoConfig.SCANNER_STATUS = "0"
    end
end